I love pantsuits. I agree you have to be pretty thin to carry this off, with thin and toned arms.
You're going to need dramatic shoes, makeup and jewelry as has been noted.
If you wear it well, you'll be a bit like Michelle Phieffer (sp?) in Scarface.
I wore one a few years ago to my high school reunion which was dressy - it had a cross-over V plunge in the boob area which makes it way more forgiving on the arms, it creates an illusion. This one is cut in a more problematic way for less than perfect arms.